An annealed copper bar of 1.6inches length and 1 inch diameter was subjected to a tensile test. The following data points were obtained for this materialthrough careful observation and experimental stress determination methods. The engineeringstress at the onset of plastic deformation was 80,000 psi. The modulus of elasticity was 720,000 psi. The strain-hardening index was 0.5. What is the strength coefficient of the material, true yield stress, and the true ultimate stress

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?